I don't suppose you were surrounded by tall buildings and maybe the GPS had a hard time getting a locked signal? Who knows! Sometimes technology just blinks out and decides to not work.
Excited to see your training towards the IronMan -- I've considered signing up for one, but am pretty intimidated by the swim portion.
No no, just didn't start it up. Yeah, I was pretty intimidated the first time I did one as well...Maybe start with a Half, and go from there.